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history of life (precamrian (It is the earliest of the geologic ages,…

- - - - Many scientists think that the seas gave life because of the volcanic vents that were crating chemical reactions that led to the first cell membranes.
        
        The first living things were bacteria, and over time they started evolving and using different sources to survive ( such as the sun ) and that would lead to the creation of simple plants
      - 2.4 billion years ago the oxygen was released from the seas and after some time the oxygen levels increased, and began to give life to more complex organisms.
- - - - after years, several organisms adapted to life on land, such as leafless plants and incertebrates.
        
        Vertebrate animals made the transition to land via the evolution of amphibians from air-breathing crossopterygian fish
- - - - At the end of the Triassic Period, roughly 201 million years ago, most amphibious creatures that lived in the tropics were wiped out, and about 65 million years ago, a giant asteroid blasted into Earth and formed a giant crater, making dinosaurs go extinct over time.
- - - - This era allowed smaller mammals to evolve and more species coming to life because most of the predators were wiped out.
        
        This era started out with rodents and small horses, and at the end there came other species such as cats, dogs and pigs
        
        This era also created to early primates, including early humans.
      - Without the dinosaurs, plant life flourished during this Era. Nearly every plant living today had its roots in the Cenozoic Era. During the early part of the era, forests overran most of North America.